I actually have the Digitech RP10, but I've always hated the distortions on those older models. I also have the more recent TC Electronics Nova system, which is digitally controlled analog ditortions, which I'm much more alright with. The Alesis Quadraverb GT also has an analog section, which I love. But those are the only two I know of that do their distortions analog-ly, and I want a wider palette. I'm sure there are other good ones, but when you're talking tone, most advice I get starts with "oh just get a <umptyump> pedal." I haven't given up -- on the contrary, I am not entirely unpleased with the direction with systems like the Fractal Audio Axe FX II. It's just a bit more dosh than I'm ready to lay out just yet, and I haven't seen it trickle-down yet.